over 1 year ago

I was trying to start a Postfix mail server on a Ubuntu 12.4:

> service postfix start
* Starting Postfix Mail Transport Agent postfix                                     [ OK ]

> telnet localhost 25
Trying 127.0.0.1...
telnet: Unable to connect to remote host: Connection refused

What? I just started the service and it should be running on port 25 but telnet won't connect, so I had to dig more:

> netstat -tulpn | grep :25 | LISTEN

Nothing?! After some Google search, I located the log file at /var/log/mail.err:

> less /var/log/mail.err

fatal: open lock file /var/lib/postfix/master.lock: cannot open file: Permission denied

No Permission? Ok, let's give it the permission:

> chown postfix.postfix -R /var/lib/postfix
> service postfix start
 * Starting Postfix Mail Transport Agent postfix
   ...done.

> netstat -tulpn | grep :25 | grep LISTEN
tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN      22166/master

Great, it worked!

P.S. chown postfix.postfix = chown postfix:postfix = chown owner_name:group_name

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